Q: Given the data in Table 3.2 (third image), how many chloride ions are present in 1 mole of $$\mathrm{BaCl}_2$$?

$$2 \times 6.02 \times 10$$^{23}$$

Question 1

Which of the following best describes the law illustrated by the balanced equation $$2 \mathrm{H}_2 + \mathrm{O}_2 \rightarrow 2 \mathrm{H}_2\mathrm{O} as $$shown in the first image?

Accepted Answer

Law of Conservation of Mass

Question 2

In the reaction $$2 \mathrm{H}_2 + \mathrm{O}_2 \rightarrow 2 \mathrm{H}_2\mathrm{O}$$, what is the correct mole ratio of hydrogen to oxygen to water?

Accepted Answer

$$2:1:2$$

Question 3

If you start with 4 moles of $$\mathrm{H}_2$$ and 2 moles of $$\mathrm{O}_2$$, how many moles of $$\mathrm{H}_2\mathrm{O}$$ can be produced according to the reaction $$2 \mathrm{H}_2 + \mathrm{O}_2 \rightarrow 2 \mathrm{H}_2\mathrm{O}$$?

Accepted Answer

4 moles

Question 4

Refer to the pie chart (second image). If the chart represents the percent composition by mass of an unknown compound, which of the following is most likely true?

Accepted Answer

The compound contains three elements in different proportions.

Question 5

Given the data in Table 3.2 (third image), how many chloride ions are present in 1 mole of $$\mathrm{BaCl}_2$$?

Accepted Answer

$$2 	imes 6.02 	imes 10$$^{23}$$

Question 6

A student has 6 slices of cheese and 14 slices of bread (as shown in the cheese images). If each sandwich requires 2 slices of bread and 1 slice of cheese, what is the maximum number of sandwiches that can be made?

Accepted Answer

6

Question 7

Which reactant is the limiting reactant in the sandwich scenario above?

Accepted Answer

Cheese

Question 8

If 0.346 mol of $$\mathrm{C}_2\mathrm{H}_4 is $$present, how many molecules of $$\mathrm{C}_2\mathrm{H}_4$$ are there? Use Avogadro’s number $$6.02 	imes 10$$^{23}$$.

Accepted Answer

$$2.08 	imes 10$$^{23}$$

Question 9

What is the percent composition by mass of carbon in $$\mathrm{C}_{12}\mathrm{H}_{22}\mathrm{O}_{11} ($$sucrose)? (Atomic weights: C = 12.01, H = 1.008, O = 16.00)

Accepted Answer

42.1%

Question 10

A reaction has a theoretical yield of 1.39 g and an actual yield of 1.12 g. What is the percent yield?

Accepted Answer

$$80.6\%$$

Question 11

Which of the following is true about the coefficients in a balanced chemical equation?

Accepted Answer

They indicate the relative number of moles of each substance involved.

Question 12

What is the empirical formula of a compound containing 36.8 g nitrogen and 63.25 g oxygen? (N: 14.01 g/mol, O: 16.00 g/mol)

Accepted Answer

$$\mathrm{N}_2\mathrm{O}_3$$

Question 13

A 5.325-g sample of methyl benzoate contains 3.758 g of carbon, 0.316 g of hydrogen, and 1.251 g of oxygen. What is the empirical formula?

Accepted Answer

$$\mathrm{C}_4\mathrm{H}_4\mathrm{O}$$

Question 14

If the empirical formula of a compound is $$\mathrm{CH}_2\mathrm{O}$$ and its molar mass is 180.12 g/mol, what is its molecular formula?

Accepted Answer

$$\mathrm{C}_6\mathrm{H}_{12}\mathrm{O}_6$$

Question 15

How many grams of $$\mathrm{CO}_2$$ are produced when 3.81 g of $$\mathrm{C}_4\mathrm{H}_{10} is $$burned in excess oxygen? ($$2 \mathrm{C}_4\mathrm{H}_{10} + 13 \mathrm{O}_2 \rightarrow 8 \mathrm{CO}_2 + 10 \mathrm{H}_2\mathrm{O}$$, MM $$\mathrm{C}_4\mathrm{H}_{10} = 58.14 g/$$mol, MM $$\mathrm{CO}_2 = 44.01 g/$$mol)

Accepted Answer

11.5 g

Question 16

Which of the following statements about limiting reactants is correct?

Accepted Answer

The limiting reactant is completely consumed in the reaction.

Question 17

A reaction requires 5.00 mmol NaCl. How many grams of NaCl should be massed? (MM NaCl = 58.44 g/mol)

Accepted Answer

0.292 g

Question 18

What is the molar mass of $$\mathrm{FeSO}_4 \cdot 7\mathrm{H}_2\mathrm{O}$$?

Accepted Answer

278.06 g/mol

Stoichiometry: Calculations with Chemical Formulas and Equations

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